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Police were trying to establish the full circumstances surrounding the incident and their investigation is continuing.

Detective Chief Inspector Jim Thomson of Forth Valley CID said: "Our thoughts and sympathies remain with the families of Peter and Paul, as well as all those affected by this tragic incident, at this very difficult time.

"A multi-agency investigation is underway to establish exactly what happened and provide both men's loved ones, and their workmates, with the answers they require.

"If anyone believes they may have any information relevant to this inquiry then please come forward."

Those with information can contact Police Scotland via 101 and quote incident number 1081 of 6th May.